15 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Deep River | 1 | 2,074 | 2,054 | -0.19% | 59 | 35 | Township |
| Standish | 2 | 1,683 | 1,681 | -0.47% | 61 | 28 | Township |
| Standish | 3 | 1,454 | 1,462 | -0.14% | 668 | 2 | City |
| Moffatt | 4 | 1,164 | 1,162 | -0.34% | 37 | 31 | Township |
| Sims | 5 | 981 | 984 | -0.51% | 86 | 11 | Township |
| Au Gres | 6 | 958 | 952 | 0.1% | 421 | 2 | City |
| Whitney | 7 | 906 | 906 | -0.55% | 29 | 31 | Township |
| Au Gres | 8 | 884 | 893 | -0.56% | 27 | 33 | Township |
| Arenac | 9 | 867 | 865 | -0.34% | 24 | 36 | Township |
| Adams | 10 | 550 | 556 | -0.9% | 15 | 36 | Township |
| Turner | 11 | 524 | 521 | -0.19% | 17 | 31 | Township |
| Sterling | 12 | 459 | 458 | 0% | 470 | 1 | Village |
| Omer | 13 | 285 | 279 | 0.35% | 252 | 1 | City |
| Twining | 14 | 142 | 142 | 0% | 146 | 1 | Village |
| Turner | 15 | 120 | 120 | 0% | 117 | 1 | Village |
Deep River is the largest city in Arenac County, with a population of 2,074.
Turner is the smallest city in Arenac County, with a population of 120.
There are 15 cities in Arenac County, Michigan.